Here is a set of M3 halftracks.
These five are the transport element of a U.S. armored platoon. 08020 code. Each model comes with both .30 and .50 cal gunners. The platoon would have three 30 cals and two 50 cals, if you want to field these five vehicles as an actual 1-to-1 platoon.
The pack also includes two strips of seated figures for the halftracks. Cost £28.00 GBP for the five.